There's always a queue somewhere at some level of resilience. Sometimes it's as mundane as the TCP buffer, some other times the other end points may become unre

There's always a queue somewhere at some level of resilience. Sometimes it's as mundane as the TCP buffer, some other times the other end points may become unresponsive for a while, including the time series DB you seem to want to take as the source of truth, or whatever that tries to resend and reconcile the requests.